Space systems — Safety requirements — Part 1: System safety

This document defines the safety programme and the technical safety requirements that are implemented in order to comply with the safety policy as defined in ISO 14300‑2. It is intended to protect flight and ground personnel, the launch vehicle, associated payloads, ground support equipment, the general public, public and private property, and the environment from hazards associated with space systems. Launch site operations are described by ISO 14620‑2 and flight safety systems in ISO 14620‑3. The safety policy is applied by implementing a system safety programme, supported by risk assessment, which can be summarized as follows. a) Hazardous characteristics (system and environmental hazards) and functions with potentially hazardous failure effects are identified and progressively evaluated by iteratively performing systematic safety analyses. b) The potential hazardous consequences associated with the system characteristics and functional failures are subjected to a hazard reduction sequence whereby: hazards are eliminated from the system design and operations; hazards are minimized; and hazard controls are applied and verified. c) The risks that remain after the application of a hazard elimination and reduction process are progressively assessed and subjected to risk assessment, in order to: show compliance with safety targets; support design trades; identify and rank risk contributors; support apportionment of project resources for risk reduction; assess risk reduction progress; and support the safety and project decision-making process (e.g. waiver approval, residual risk acceptance). d) The adequacy of the hazard and risk control measures applied are formally verified in order to support safety validation and risk acceptance. e) Safety compliance is assessed by the project and safety approval obtained from the relevant authorities.

Systèmes spatiaux — Exigences de sécurité — Partie 1: Sécurité système

General Information

Status
Published
Publication Date
27-Aug-2018
Current Stage
6060 - International Standard published
Start Date
28-Aug-2018
Completion Date
28-Aug-2018
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INTERNATIONAL ISO
STANDARD 14620-1
Second edition
2018-09
Space systems — Safety
requirements —
Part 1:
System safety
Systèmes spatiaux — Exigences de sécurité —
Partie 1: Sécurité système
Reference number
ISO 14620-1:2018(E)
ISO 2018
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ISO 14620-1:2018(E)
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ii © ISO 2018 – All rights reserved
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ISO 14620-1:2018(E)
Contents Page

Foreword ......................................................................................................................................................................................................................................vii

Introduction ............................................................................................................................................................................................................................viii

1 Scope ................................................................................................................................................................................................................................. 1

1.1 General ........................................................................................................................................................................................................... 1

1.2 Field of application .............................................................................................................................................................................. 2

1.3 Tailoring ........................................................................................................................................................................................................ 2

2 Normative references ...................................................................................................................................................................................... 2

3 Terms, definitions and abbreviated terms ................................................................................................................................ 2

3.1 Terms and definitions ....................................................................................................................................................................... 2

3.2 Abbreviated terms ............................................................................................................................................................................... 5

4 System safety programme .......................................................................................................................................................................... 6

4.1 Scope ................................................................................................................................................................................................................ 6

4.2 Safety organization .............................................................................................................................................................................. 6

4.2.1 General...................................................................................................................................................................................... 6

4.2.2 Safety representative ................................................................................................................................................... 6

4.2.3 Reporting lines .................................................................................................................................................................. 6

4.2.4 Safety integration ............................................................................................................................................................ 6

4.2.5 Coordination with others ......................................................................................................................................... 6

4.3 Safety representative access and authority ................................................................................................................... 6

4.3.1 Access ........................................................................................................................................................................................ 6

4.3.2 Delegated authority to reject — stop work .............................................................................................. 7

4.3.3 Delegated authority to interrupt operations ........................................................................................... 7

4.3.4 Conformance ....................................................................................................................................................................... 7

4.3.5 Approval of reports ........................................................................................................................................... ............. 7

4.3.6 Review ...................................................................... ................................................................................................................. 7

4.3.7 Representation on boards........................................................................................................................................ 7

4.4 Safety risk management .................................................................................................................................................................. 7

4.4.1 Safety risks ............................................................................................................................................................................ 7

4.4.2 Hazard assessment ........................................................................................................................................................ 7

4.4.3 Preferred measures ....................................................................................................................................................... 8

4.5 Project phases and safety review cycle .............................................................................................................................. 8

4.5.1 Progress meetings .......................................................................................................................................................... 8

4.5.2 Project reviews .................................................................................................................................................................. 8

4.5.3 Safety programme review .....................................................................................................................................10

4.5.4 Safety data package ....................................................................................................................................................10

4.6 Safety programme plan ................................................................................................................................................................11

4.6.1 Implementation .............................................................................................................................................................11

4.6.2 Safety activities ..............................................................................................................................................................11

4.6.3 Definition .............................................................................................................................................................................11

4.6.4 Description .................. .................................................... ...................................................................................................11

4.6.5 Safety and project engineering activities .................................................................................................11

4.6.6 Supplier and sub-supplier premises ............................................................................................................11

4.6.7 Conformance ....................................................................................................................................................................11

4.7 Safety certification ............................................................................................................................................................................12

4.8 Safety training .......................................................................................................................................................................................12

4.8.1 Overall training ..............................................................................................................................................................12

4.8.2 Participation .....................................................................................................................................................................12

4.8.3 Detailed technical training ...................................................................................................................................12

4.8.4 Product specific training ........................................................................................................................................12

4.8.5 Records ..................................................................................................................................................................................12

4.8.6 Identification ....................................................................................................................................................................12

4.9 Accident/incident reporting and investigation .......................................................................................................13

4.10 Safety documentation ....................................................................................................................................................................13

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ISO 14620-1:2018(E)

4.10.1 General...................................................................................................................................................................................13

4.10.2 Customer access ............................................................................................................................................................13

4.10.3 Supplier review ..............................................................................................................................................................13

4.10.4 Documentation ...............................................................................................................................................................13

4.10.5 Safety data package ....................................................................................................................................................13

4.10.6 Safety deviations and waivers ...........................................................................................................................14

4.10.7 Verification tracking log .........................................................................................................................................14

4.10.8 Lessons-learned file ...................................................................................................................................................14

5 Safety engineering ...........................................................................................................................................................................................15

5.1 Safety engineering objectives ..................................................................................................................................................15

5.1.1 General...................................................................................................................................................................................15

5.1.2 Elements ..............................................................................................................................................................................15

5.1.3 Lessons learned .............................................................................................................................................................15

5.2 Safety design principles ...............................................................................................................................................................15

5.2.1 Human life consideration ......................................................................................................................................15

5.2.2 Design selection .............................................................................................................................................................15

5.2.3 System safety order of precedence ...............................................................................................................15

5.2.4 Environmental compatibility .............................................................................................................................16

5.2.5 Safe without services ................................................................................................................................................16

5.2.6 Fail safe design ...................................................................... ..........................................................................................16

5.2.7 Hazard detection — Signalling and safing ..............................................................................................17

5.2.8 Access .....................................................................................................................................................................................17

5.2.9 Safety risk reduction and control ...................................................................................................................17

5.3 Failure tolerance requirements .............................................................................................................................................19

5.3.1 Basic requirements .....................................................................................................................................................19

5.3.2 Software................................................................................................................................................................................20

5.3.3 Payload interface ..........................................................................................................................................................20

5.3.4 Redundancy separation ..........................................................................................................................................20

5.3.5 Failure propagation ....................................................................................................................................................20

5.3.6 Design for minimum risk .......................................................................................................................................21

5.3.7 Probabilistic safety targets...................................................................................................................................21

5.4 Identification and control of safety critical functions ........................................................................................22

5.4.1 Identification ....................................................................................................................................................................22

5.4.2 Inadvertent operation ..............................................................................................................................................22

5.4.3 Provisions ...........................................................................................................................................................................22

5.4.4 Shutdown and failure tolerance requirements ...................................................................................22

5.4.5 Electronic, electrical, electromechanical ..................................................................................................22

6 Safety analysis requirements and techniques ....................................................................................................................23

6.1 General ........................................................................................................................................................................................................23

6.2 Assessment and allocation of requirements ..............................................................................................................23

6.2.1 Safety requirements ...................................................................................................................................................23

6.2.2 Additional safety requirements .......................................................................................................................23

6.2.3 Define safety requirements — functions .................................................................................................23

6.2.4 Define safety requirements — subsystems ...........................................................................................23

6.2.5 Justification ........................................................................................................................................................................23

6.2.6 Functional and subsystem specification ..................................................................................................24

6.3 Safety analysis ......................................................................................................................................................................................24

6.3.1 General...................................................................................................................................................................................24

6.3.2 Mission analysis .............................................................................................................................................................24

6.3.3 Feasibility ............................................................................................................................................................................24

6.3.4 Preliminary definition ..............................................................................................................................................24

6.3.5 Detailed definition, production and qualification ............................................................................24

6.3.6 Utilization ............................................................................................................................................................................24

6.3.7 Disposal ................................................................................................................................................................................24

6.4 Specific safety analysis ..................................................................................................................................................................25

6.4.1 General...................................................................................................................................................................................25

6.4.2 Hazard analysis ..............................................................................................................................................................25

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ISO 14620-1:2018(E)

6.4.3 Safety risk assessment .............................................................................................................................................25

6.4.4 Safety analysis for hardware-software systems .................................................................................26

6.5 Supporting assessment and analysis ................................................................................................................................27

6.5.1 General...................................................................................................................................................................................27

6.5.2 Warning time analysis ..............................................................................................................................................27

6.5.3 Caution and warning analysis............................................................................................................................27

6.5.4 Common cause and common mode failure analysis ......................................................................27

6.5.5 Fault tree analysis ........................................................................................................................................................28

6.5.6 Human dependability analysis .........................................................................................................................28

6.5.7 Failure modes, effects and criticality analysis .....................................................................................28

6.5.8 Sneak analysis .................................................................................................................................................................28

6.5.9 Zonal analysis ..................................................................................................................................................................29

6.5.10 Energy trace analysis ................................................................................................................................................29

7 Safety verification ............................................................................................................................................................................................30

7.1 General ........................................................................................................................................................................................................30

7.2 Tracking of hazards ..........................................................................................................................................................................30

7.2.1 Hazard reporting system .......................................................................................................................................30

7.2.2 Status ......................................................................................................................................................................................30

7.2.3 Safety progress meeting .........................................................................................................................................30

7.2.4 Review and disposition ...........................................................................................................................................30

7.2.5 Documentation ...............................................................................................................................................................30

7.2.6 Mandatory inspection points .............................................................................................................................30

7.3 Safety verification methods ......................................................................................................................................................31

7.3.1 Verification engineering and planning.......................................................................................................31

7.3.2 Methods and reports .................................................................................................................................................31

7.3.3 Verification requirements .....................................................................................................................................31

7.3.4 Analysis .................................................................................................................................................................................31

7.3.5 Inspections .........................................................................................................................................................................31

7.3.6 Tests .........................................................................................................................................................................................31

7.3.7 Verification and approval ......................................................................................................................................31

7.4 Qualification of safety critical functions ........................................................................................................................32

7.4.1 Verification .........................................................................................................................................................................32

7.4.2 Qualification ......................................................................................................................................................................32

7.4.3 Failure tests .......................................................................................................................................................................32

7.4.4 Verification of design or operational characteristics ....................................................................32

7.4.5 Safety verification testing ......................................................................................................................................32

7.5 Hazard close-out .................................................................................................................................................................................32

7.5.1 Safety assurance verification..............................................................................................................................32

7.5.2 Safety approval authority ......................................................................................................................................32

7.6 Residual risk reduction .................................................................................................................................................................33

8 Operational safety ............................................................................................................................................................................................33

8.1 General ........................................................................................................................................................................................................33

8.2 Basic requirements ..........................................................................................................................................................................33

8.3 Flight operations and mission control .............................................................................................................................33

8.3.1 Launcher operations .................................................................................................................................................33

8.3.2 Contamination ................................................................................................................................................................33

8.3.3 Flight rules .........................................................................................................................................................................33

8.3.4 Hazardous commanding control .....................................................................................................................34

8.3.5 Mission operation change control .......................................
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